Individual Paper Filter Roll is designed for use with the BUNN Sure Immersion Bean to Cup machine for even distribution & clarity in your cup. It works in Sure Immersion models to support the extraction process, a hybrid of filter drip & immersion brewing that mimics other single-cup processes. Air Infusion process allows increasing or decreasing body & for the unlocking & enhancement of subtle flavor characteristics. This hybrid brewing combines the best of these two processes, ensuring each cup of Sure Immersion coffee gives off the exact aroma & flavor you desire. The roll of paper filter is easy to install. The machines each use approximately 5-1/2" of paper every cup so the roll lasts approximately 1,472 cups depending on the model.